1、20112012x2011— 20102011x2010
=(20112011+1)x2011- (20112011-10000)x2010
=20112011x2011-20112011x2010+2011+20100000
=20112011+20102011
=40214022
2、1x3+3x5+5x7+7x9+...+99x101
=2x2-1+4x4-1+6x6-1+8x8-1+...+100x100-1
=4x(1x1+2x2+.+50x50)-50
=4x50x51x101/6-50
=171650